标题： 使用GATE软件包估算J-PET断层扫描仪的NEMA特性 显示英文标题

标题： Estimating the NEMA characteristics of the J-PET tomograph using the GATE package

摘要： 由{J-PET}合作组开发的基于塑料闪烁体的新一代全身PET系统。 它由沿轴向排列成圆柱形的塑料闪烁体条带组成，使得可以经济地构建全身PET。 为了确定扫描仪原型的特性并优化其几何结构，使用GATE软件进行了先进的计算机模拟。 根据NEMA标准，空间分辨率、灵敏度、散射分数和噪声等效计数率被估计为断层扫描仪长度、检测层数、断层扫描室直径以及所采用的读出类型的各种函数。 对于直径为85厘米、条带长度为100厘米、截面为4毫米x20毫米，并采用带有额外波长转换层的硅光电倍增管作为读出的单层几何结构，扫描仪中心的空间分辨率（FWHM）为3毫米（径向、切向）和6毫米（轴向）。 对于具有相同读出方式、直径和闪烁体长度的类似双层几何结构，条带截面为7毫米x20毫米，在40 kBq/cc的活性浓度下达到了300 kcps的NECR峰值，散射分数估计约为35%，中心灵敏度达到14.9 cps/kBq。 还确定了灵敏度分布。 显示英文摘要

摘要： The novel whole-body PET system based on plastic scintillators is developed by the {J-PET} Collaboration. It consists of plastic scintillator strips arranged axially in the form of a cylinder, allowing the cost-effective construction of the total-body PET. In order to determine properties of the scanner prototype and optimize its geometry, advanced computer simulations using the GATE software were performed. The spatial resolution, the sensitivity, the scatter fraction and the noise equivalent count rate were estimated according to the NEMA norm as a function of the length of the tomograph, number of the detection layers, diameter of the tomographic chamber and for various types of the applied readout. For the single-layer geometry with the diameter of 85 cm, strip length of 100 cm, cross-section of 4 mm x 20 mm and silicon photomultipliers with the additional layer of wavelength shifter as the readout, the spatial resolution (FWHM) in the centre of the scanner is equal to 3 mm (radial, tangential) and 6 mm (axial). For the analogous double-layer geometry with the same readout, diameter and scintillator length, with the strip cross-section of 7 mm x 20 mm, the NECR peak of 300 kcps was reached at 40 kBq/cc activity concentration, the scatter fraction is estimated to about 35% and the sensitivity at the centre amounts to 14.9 cps/kBq. Sensitivity profiles were also determined.